Especially with how easily preventable this whole debacle could have been!

After being foolish enough to try to bring his pet Capuchin monkey, OG Mally, into Germany two months ago without the proper paperwork, Justin Bieber left the poor little guy there…and had until midnight yesterday to re-claim him before he became the country's property!

We previously mentioned that Dianna Hanson, 24, was killed by a lion at Project Survival's Cat Haven sanctuary in Dunlap, California.

Now we know more about what actually happened to her.

The authorities believe that the lion opened its cage with its paw and attacked the woman as she was cleaning its holding area.

The corner who examined her and spoke with investigators said:

"The lion had been fed, the young woman was cleaning the large enclosure, and the lion was in the small cage. The gate of the cage was partially open, which allowed the lion called Cous Cous to lift it up with his paw. He ran at the young lady."

The coroner then said that the lion broke her neck, probably with just one swipe of its paw.

She would've died instantly.

Though this whole situation is awful, at least she was already gone when the lion began tossing her body around.

All bites and scratches were inflicted after she was already dead.

Still, its so so sad that she was killed.

We hope the sanctuary changes its policies so that nothing like this can ever happen again.

Sadly, while inside a male lion's enclosure one night, she was attacked!

The Sheriff's Department released a statement:

"Upon arrival, deputies observed the victim, who appeared to be severely injured, inside the African lion enclosure with an adult male African lion. Another employee had made several attempts to distract the lion away from the victim and into another enclosure prior to the deputy's arrival, but all attempts failed. Deputies shot and killed the lion to provide medical attention to the victim. The victim died at the scene."

The sanctuary is now working with the Sheriff's Department to find out exactly what happened.

It's not known if Dianna was supposed to be in the cage or not, and the circumstances of the mauling aren't fully known.

This is just so awful.

Her friends and family are in our hearts and thoughts.

Check out the video (above) to learn a little bit more about the whole awful incident.